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Unknown Kernel (CentOS 2.6.32-754.el6.x86_64)

Discussion in 'General Discussion' started by morrow95, Jul 4, 2018.

  1. morrow95

    morrow95 Well-Known Member

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    Did a yum update through WHM with a graceful reboot after. The kernel was updated. Since the update I am getting the following email every 4 hours :

    subject : Cron <root@jupiter> /usr/bin/kcarectl --auto-update --gradual-rollout=auto
    body : Unknown Kernel (CentOS 2.6.32-754.el6.x86_64)
     
  2. dalem

    dalem Well-Known Member
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    That email indicates that you have installed a kernel that either has no Kernelcare patches applied to it as of yet.

    you will receive an email every 4 hours (the default frequency that Kernelcare checks for available kernel patches) until Cloudlinux has issued a patch for that particular kernel, and your system has downloaded it and installed it.
     
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  3. morrow95

    morrow95 Well-Known Member

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    That doesn't seem like the correct behavior. I used the update within WHM. I have the kernelcare patch applied. Shouldn't ONLY compatible kernels ever be installed? That makes the most logical sense, especially considering this was done in WHM. I could see if I updated the kernel through cli, but within WHM and with the patch I would expect that only kernels compatible could ever be used to prevent this sort of thing from happening.
     
  4. vacancy

    vacancy Well-Known Member

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    The kernelcare patch is specially configured for each kernel.

    A few days after the new kernel is released, a new patch will be released by cloudlinux, and the kernelware board will be installed automatically when the patch is released.

    Do not worry.
     
    #4 vacancy, Jul 5, 2018
    Last edited: Jul 5, 2018
  5. dalem

    dalem Well-Known Member
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    Vacancy is correct nothing to worry about
    you are all ready running the latest kernel so you all ready have the latest changes
    When kernelcare updates the patches the email will go away.
     
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  6. cPanelLauren

    cPanelLauren Forums Analyst
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    The two processes are different, the kernel update then the subsequent kernel-care patch update. In the event you never want to receive a kernel before the kcare patch for it is available you'd need to disable automatic kernel updates which I wouldn't advise.

    Thanks!
     
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  7. celiac101

    celiac101 Well-Known Member

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    Thank you for replying to the poster's concerns, and now you get to hear mine :)

    I think the point here is that I've never received this type of email, EVER, in all the years I've run my server. Now I am getting this to. Obviously there is some error, or I wouldn't get a useless email. I mean really, what exactly does this tell me, and why would I need to be sent an email about this???

    Unknown Kernel (CentOS 2.6.32-754.el6.x86_64)
     
  8. cPanelLauren

    cPanelLauren Forums Analyst
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    Hi @celiac101

    As indicated before, the email is from a cron job that is created when the KernelCare patch is added. KernelCare checks the kernel periodically to ensure you're using a version KernelCare supports. You're getting the email because your kernel updated before KernelCare patched the new kernel and because of that the kernel version is unsupported by KernelCare.
     
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  9. sparek-3

    sparek-3 Well-Known Member

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    I suggest that if you want to be angry with someone, be angry with the Kernelcare team. It can take them up to a week or better to release a Kernelcare patch for a new kernel. Is that reasonable? I don't know. But if you are expecting Kernelcare to protect you the very second that a new kernel is released... you've got lofty expectations.

    Either way... this is not a cPanel issue.
     
  10. Gojko

    Gojko Well-Known Member

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    I don't have kernelcare and cloudlinux but i still get this emails, why?
     
  11. vacancy

    vacancy Well-Known Member

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    You can run the command ssh and say the result?

    Code:
    kcarectl --info
     
  12. sparek-3

    sparek-3 Well-Known Member

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    You're probably using Kernelcare's free patch-set for symlink protection.
     
  13. cPanelLauren

    cPanelLauren Forums Analyst
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    Hi @Gojko

    The only reason I can think of that you'd get this notification is if you're using Kernelcare's free patch set for symlink protection as suggested by @sparek-3 and the command suggested by @vacancy would be useful to determine whether or not that's true.

    Thanks!
     
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  14. celiac101

    celiac101 Well-Known Member

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    I never signed up for Kernal Care, yet I'm still getting this message every 4 hours. Perhaps I am using their free symlink protection...no idea. When will this message stop? Do I really have to wait until there is a new kernel update?
     
  15. vacancy

    vacancy Well-Known Member

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    I gave you a command line to control.

    Code:
    kcarectl --info
    We do not know when the kernel patch will come. If there is no special situation, it is sent within 1 week.

    Alternatively you can downgrade the kernel. When you install a kernel with patches, the system will activate the kernelcare patch.
     
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  16. Gojko

    Gojko Well-Known Member

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    command output:
    Code:
    Unknown kernel (CentOS Linux 3.10.0-862.6.3.el7.x86_64), no patches available
     
  17. cPanelLauren

    cPanelLauren Forums Analyst
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    This indicates you do indeed have the KernelCare (more than likely the free symlink protection patch) installed but you're using a kernel version that is not currently supported. Once they update to the new kernel you'll stop receiving notifications.

    On a server without any kernelcare installed you'll see:

    Code:
    [root@server ~]# kcarectl --info
    -bash: kcarectl: command not found
     
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  18. sparek-3

    sparek-3 Well-Known Member

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    Anybody that has questions about this "issue", I would encourage you to visit:

    Unknown Kernel again
     
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  19. vacancy

    vacancy Well-Known Member

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    The reason for the delay is explained here.

    Some of the servers have crashed in a previously published kernel care patch, so it is reported that a longer test will be done before patches are released. for this reason patches are being published late.

    KernelCare Unsuccessful Release Information
     
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  20. cPanelLauren

    cPanelLauren Forums Analyst
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    @sparek-3 and @vacancy

    Thank you both for the information and followup on this thread!
     
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